Added an iOS resource and then categorised the resources section by operating systems

Author: Ayoola Salako

README.md

@@ -219,6 +219,8 @@ The complete collection of (consumer) Raspberry Pi models consist of:
 
 ### Useful Apps
 
+#### Android
+
 - **AndFTP** - Alternative FTP client app. [Android](https://play.google.com/store/apps/details?id=lysesoft.andftp)
 - **Home Remote Control** - Control mouse/keyboard, volume, manage download/upload files, custom commands, terminal, execute tasks in future, control media. [Android](https://play.google.com/store/apps/details?id=com.inspiredandroid.linuxcontrolcenter)
 - **Kore Remote** - Official remote to control Kodi. [Android](https://play.google.com/store/apps/details?id=org.xbmc.kore)
@@ -232,6 +234,10 @@ The complete collection of (consumer) Raspberry Pi models consist of:
 - **Turbo FTP** - A good FTP client app for accessing files on raspberry. [Android](https://play.google.com/store/apps/details?id=turbo.client)
 - **VNC Viewer** - To remotely control Raspberry Pi desktop. [Android](https://play.google.com/store/apps/details?id=com.realvnc.viewer.android&hl=en)
 
+#### iOS
+
+- **RaspController** - Allows you to easily manage your Raspberry Pi remotely, control the GPIO ports, send commands directly through the terminal and so much more. [iOS](https://apps.apple.com/app/raspcontroller/id1584315865)
+
 ### Articles
 
 - [10 Ways To Power](https://raspberrypi.about.com/od/Power/tp/10-Ways-to-Power-your-Raspberry-Pi.htm) - Information about different & correct ways to power the pi.